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Public Notification Requirements

What is Public Notification?

  • Public notification is a federal rule that requires drinking water providers, such as the city of Glendale, to make customers aware of instances where the water provider violates the drinking water standards.
  • The type, distribution, and timing of the public notices depend largely upon the nature of the violation. Under the new rule, serious violations need to be communicated within 24 hours of discovery.
  • The Public Notification Rule establishes three tiers of events for which public notice must be provided.


Type of Event

Federal Requirement

Tier 1

  • Coliform bacteria
  • Nitrate
  • Chlorine dioxide
  • Turbidity
  • Waterborne disease outbreak
  • Other events as determined by County

24 hours after utility becomes aware of monitoring results, and requires consultation with County. The 24-hour requirement may demand use of radio and television.

Tier 2

  • All other Maximum Contaminant Level and treatment technique violations
  • Monitoring violations
  • Failure to comply with variance or exemption

30 days after utility becomes aware of monitoring results. Notification can be made by direct mail and newspaper advertisement or posting.

Tier 3

  • Monitoring and testing procedure violations
  • Operating under a variance or exemption
  • Fluoride Secondary Maximum Contaminant Level violation
  • Unregulated Contaminant Monitoring results

12 months after utility becomes aware of monitoring results. Normally notice would be included in the next annual Consumer Confidence Report.

  • A violation of the Maximum Contaminant Level drinking water standard occurs when an analyzed sample contains concentrations of a contaminant greater than what the standard allows and a follow-up analysis of a confirmation sample verifies the initial finding.
  • The Tier 1 requirement to provide public notices within 24 hours for certain events makes compliance a challenge, and will likely require the use television and radio notice.
  • Notification must be made to all city water customers.
  • The city is required to use specific health effects language/wording in their public notifications. The specific wording describes the potential health effects of the contamination event for which the notice is provided.

What plans are in place?

  • The city prepared a Public Notification: Drinking Water Advisory Plan for Tier 1 Violations. The plan provides the framework and action steps to protect public health. The city periodically updates the plan.








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